>> reporter: but just outside, in one front yard after the next, bernie sanders signs. and despite the signs, the clinton campaign is predicting a victory in iowa. they do concede it will be close. they're banking on the ground game to pull off the win coming next monday. >> this will really be the battle between ground games. cecilia, thank you. we have breaking news from canada, a shooting at a school in saskatchewan. the school, housing grades 7 through 12. five people are dead, two critically injured. an alleged shooter is in custody at this hour. and in flint, michigan, the whistleblower speaking out, saying it should never have happened. claiming when one family raised a red flag, he listened. alex perez, back on the case at the house where it might have all started. >> reporter: tonight, our first glimpse at ground zero in flint, michigan.